WII.l.lSTON: KANSAS PTERODACTYLS. 8 1 



a nearly spherical head, and small trochanter — all of which, together 

 with the rather shallow, imperforate acetabulum, would indicate great 

 freedom of movement in the legs and a corresponding lack of strength. 

 The tibia is a slender bone, without marked cnemial crest, and with 

 a well-developed trochlear surface below. I know of no indication 

 of a separate fibula. 



There are three tarsal bones, two of which are cuboid or angular 

 in shape. The third is larger, and has a downwardly directed, 

 pointed, curved process; it seems to be a rudimentary fifth digit. 

 The foot is elongate and slender, the metatarsals articulating closely 

 together above, with the claws much smaller and less curved than 

 those of the manus, save, perhaps, in the inner digits, where they seem 

 to be wanting, the preceding phalanx being obtusely pointed. There are 

 four functional toes, with probably a rudiment of the fifth, as already 

 stated. The relative lengths of the elongated metatarsals may be 

 indicated by the figures 2, i, 3, 4, the second being the longest. The 

 phalanges may be represented by the formula I-i, II-2, ni-4, IV-5, 

 thus, as in the European species, corroborating the evidence that the 

 fifth toe is the one that is missing. All the phalanges are slender, 

 save the second one in the third toe, and the second and third in the 

 fourth toe, where they are scarcely longer than wide. 



EXPLANATION OF FIGURE. 



Pelvis and leg of Ornitlwstoiua iiigens, one fifth natural size. //, 

 ilium; Is, ischium; P, prepubis; F, femur; 77^ tibia; T, tarsus; /, V, 

 first, fifth digits. 



